Rotary pump



G. B. PETSCHE.

ROTARY PUMP.

APPLICATION FILED SEPT-25,1920- Patented May 31, 1921,

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A TTORNEY z m fm, Mu F0 n M R J mm I M pv n n PJ A. I m W K f n J z i I m J n 1 l1 2 INVENTOR ATTORNEY GUSTAN' B. PETSCHE, OF YONKERS, NEW YORK.

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Specification of Letters Patent.

Patented May 31, 1921.

Application filed September :ti-5, 1920. Serial No. 412,821.

accompanying drawings, which form a partthereof.

My invention relates to rotary pumps of the type in which the rotary piston is actuated by an eccentric and provided with a slide extending from one side through a swivel vblock and the object of my invention is to provide a pump of this type in which the delivery passage is formed through the slide and provided with a non-return valve opening to permit the flow of fluid from the -pump and closed by contact with a stop supported on a fixed portion of the pum casin and preferably made elastically yie ding.

'he nature of my improvements will be best understood as 4described in connection with the drawings in which they are illustrated and in which- Figure 1 is a section on the line 1 1 of Fig. 2 of a pump provided with my improvement.

Fig. 2, a front elevation of the pump showing it as embodying two pumps opening into the same delivery chamber with the left hand pump shown in section on the line 2--2 of Fi 1 with the piston and slide shown in ful Fig. 3 is an enlarged view of the slide and valve with certain preferable accessories not shown in Fig. 1, the view being taken partly in section.

. Fig. 4 is a similar view of a modified construction of slide and valve. y

Fig. 5 is again a similar view'of another modified construction of slide and valve.

Fig. 6 is a cross sectional view on the line 6 6 of Fig. 5.

Fig. 7 is a face view of the gridiron valve shown in Fig. 5.

Fig. 8 is a view showin a modified construction of the device wit which the valve stem contacts to close the valve.

Fig. 9 is aview similar to Fig. 1 but show- .ing the pump equipped with still another modified construction of slide and valve and of a different form of contacting device from that shown in the former figures. The section is on line 9-9 of Fig. 2.

Fig. 10 is an elevation partly in section on line 10-10 of Fig. 9 similar to Fig. 2 but showing a modified device of Fig. 9. y

Fig. 11 is a view on an enlarged scale of the slide valve and valve actuating ymechanism shown in Fig. 9.

Fig. l2 is a sectional elevation showing a preferred detail in connection with the construction shown in Figs. 9, 10 and 11, and

Fig. 13 is a view generally similar to Fig. 12 and showing the valve in closed position.

A and A indicate two formed, as shown, in the same caslng and having their outer faces closed by the face plates A2 and A2. A4 indicates the cylindrical surface of the pump cylinder. B is the bearing formed in the casing for the swivel block. B is the delivery chamber of the pump connecting with an outlet passage indicated at B2. B8 is the inlet passage of the pump; C is a cover plate closing the passage of the chamber B. C', Figs. 1 and 2, indicates metal bars preferably elastically yieldingly supported inline with the valvestem to be described. D is the drivin shaft of the pump; D an eccentric secure to this shaft. E is an eccentric ring piston making a line contact with the cylinder surface A4. F is the slide attached to the eccentric ring and working in the guide slot formed in the swivel block indicated at M. F is a delivery port opening through the lower portion of the slide F and communicating with the passage F 2 formed through the slide and opening into the delivery chamber B'. Fa is the valve seat formed in this passage and F4 is a guide formed in or attached to the slide in which works the valve stem. G is a valve adapted to work in connection with the valve seat F 3 having avalve stem G which extends up upon the top 0f the slide in position to contact with the stop plate indicated at C. The path through which the top of the valve stem will travel when in fully arrived position is indicated at J and it will be obvious that the stop plate C intersects this path and will cause the closing of the valve G when the slide is in the highest position. 1t will be obvious, of course, that this curve will, under varying constructions of the pump, vary from the circular form shown.

1n the construction shown in Fig. 3 a dash pump cylinders pot cylinder H is formed in the slide with be obvious that by using a restricted port R2 the actuating cylinder h vwill serve also as a dash pot cylinder.

In the construction shown in Figs. 9, 10 and 11 the valve N is yopened as soon as the pressure in the port F exceeds the receiver pressure, the o ening movement of the valve being pre erably checked by the devices shown in Figs. 12 and 13. slide F moves upward the'plunger 0'- approaches the cylindrical yvalve Stem and finally contacts with it and closes the valve, the plunger and its connections with the fixed part of the casing as described being in a broad se'nse the full .equivalent for the contact plate C described in connection with the other figures ofthe drawin The advantage of having the device .and through it the plunger, adjustable from outside by the means described will be obvious as this way the valvecan be-caused to seat itself at the 'exact time and with the exact pressure most desirable.

Having now described m invention, what I claim as new and rdesire to secure by Letters Patent, is:

1. In a rotary pump comprising a cylinder, anl eccentric ring piston and a slide extending from the piston through a swivel" block, a discharge passage formed through the slide, a non-return valve for` closing said passage, moving with the slide and arranged to open automatically to permit the Huid to pass from the pump into the retending from the piston through a swivel As the.

block, .a .discharge passage formed through the slide, a non-return valve for closing said passage, moving with the slide and airranged to open automatically to permit the fluid to pass from the pump into the receiver, means for cushioning the movements of the lvalve and a valve closing stop supported on a xedposition of the casing and located to contact with and close the valve at the end of each rotative movement of the piston.

3. In a rotary pump comprising a c l-` inder, an eccentric ring piston and a sllde extending from the piston through a swivel block, a discharge passage formed through the slide, a non-return valve for closing said passage, moving with the slide and arranged to open automatically to permit the Huid to pass from the pump into the receiver, and an lelastically yielding valve closing sto supported on a fixed position of the casing and located to contact with and close the valve at the end of each rotative movement of the piston. r

GUSTAV B. PETSCHE. 

